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Efficient parallel binary search on sorted arrays, with applications

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1 Author(s)
Chen, D.Z. ; Dept. of Comput. Sci., Purdue Univ., West Lafayette, IN, USA

Let A be a sorted array of n numbers and B a sorted array of m numbers, both in nondecreasing order, with n⩽m. We consider the problem of determining, for each element A(j), j=1, 2, …, n, the unique element B(i), 0⩽i⩽m, such that B(i)⩽A(j)<B(i+1) (with B(0)=-∞ and B(m+1)=+∞). We present an efficient parallel algorithm for solving this problem in O(log m) time using O([nlog (m/n)]/[log m]) EREW PRAM processors. Our algorithm improves the previously known results on either the time or processor complexity, and enables us to solve several other problems optimally on the EREW PRAM

Published in:

Parallel and Distributed Systems, IEEE Transactions on  (Volume:6 ,  Issue: 4 )

Date of Publication:

Apr 1995

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